Method for burning different fuels



Oct. 21, 1930.

A. V. ADAMSON METHOD FOR BURNING DIFFERENT FUELS Filed Sept. 2 925Patented Oct. 21, 1930 UNITED STATES P TENT OFFICE j ARTHUR v. ADAMSON,OF HEMrsTEAn, NEW YORK, ssIGNoE To INTERNATIONAL COMBUSTION ENGINEERINGooEPoRATIoN, A CORPORATION OF DELAWARE METHOD ron BURNING DIFFERENTEUELs Application filed September This invention relates to furnaces,particularly boiler furnaces, for burning different fuels, such aspulverized coal, saw-dust and hog fuel, that is, waste combustiblematerial of wood-working plants and the like.

One of the primary objects of the invention is to provide a furnace inwhich such fuels can be effectively burned, either together oralternately.

How the foregoing, together with such other objects as may hereinafterappear, or are incident to my invention, are realized, is illustrated inpreferred form in the accompanying drawings, wherein Fig. 1 is'avertical section thru a furnace and boiler embodying my improvements,and

Fig. 2 is a fragmentary section illustrating the arrangement of burners.

Referring now to Fig. '1, the combustion chamber A is approximatelyrectangular in cross section and has considerable vertical height. Thecombustion chamber is set in front of the boiler B and has an ash-pit 7.The side and front walls of the furance are hollow, the space beingdivided into horizontally extending channels 8 having air intakeopenings 9 at the rear and inlets 10 into the furnace in the front wall.The fuel is introduced thru the arch 11 by means of pulverized coalburners 12 and other burners 13 arranged in alternation therewith forsup plying the saw-dust or other fuel, the said burners l2 and 13communicating with conduits 12 and 13', respectively, which are extendedto suitable bins or sources (not shown) of coal and saw-dust.

Located above the ash-pit 7 is a water screen 14 composed of spacedtubes connected into the headers 15 and 16. Downcomers 17 connect theheader 15 with the water space of the boiler and upcomers 18 connect theheader 16 with the upper portion of the boiler to provide forcirculation thru the water screen. The spacing of the tubes of the waterscreen is such as to permit gravitating refuse to freely passtherebetween to the ash-pit.

Immediately above the Water screen are arranged a plurality of airinlets 19 thru which air is supplied under pressure as by 2, 1925.Serial No. 53,992,

a fan 20. Beneath the water screen 14 are other inlets 21 and 22, whichmay or may not be used as the case may demand. The lower of the inlets22 also serve as cleanout openings.

Normally the boiler is fed by pulverized below the slagging point inpassing thru the cool zone created by the screen 14. Usually there isnot enough of the saw-dust or other coarse fuel to operate the boilercontinuously except in combination with pulverized coal. Therefore, whensuch fuel is available I introduce it in a downward directionintermediate the streams of pulverized fuel, whereby such fuel iseffectively subjected to radiant heat, not only from the refractoriesbut also from the already burning flames, the saw-dust streams being forall practical purposes subject on all sides to radiant heat or flame.Hence this fuel is very largely consumed before it ever reaches thebottom.

A portion of the air required for combustion is admitted thru. theburners, particularly the pulverized fuel burners and secondary air forcombustion is admitted thru the inlets 10, the air admitted thru suchinletsbeing pre-heated and assisting thereby in the burning of thesaw-dust. The air admitted thru the inlets 19 also tends to complete thecombustion of the'saw-dust before it reaches the ash-pit, this being soparticularly where such air is introduced under pressure which has theeffect of producing swirling and agitation in the lower regions of thecombustion space. If, for any reason, some of the saw-dust should lodgein the bottom while still burning, the air admitted thru the inlets 21and 22 will serve to complete the combustion thereof on the floor of theash-pit. If heavier fuels are used the screen Will function some what asa grate, in which event the.

grade pulverized coal and relatively coarse low grade fuel in acombustion chamber having an ofi'take in an upper part thereof whichincludes admitting the relatively high and low grade fuels inalternately arranged streams of flattened configuration, the saidstreams presenting their flat surfaces to each other and being directeddownwardly to bend on edge to said ofitake.

In testimony whereof, I have hereunto signed my name.

ARTHUR V, ADAMSON.

